components/cpu.c

   1 /* See LICENSE file for copyright and license details. */
   2 #include <stdint.h>
   3 #include <stdio.h>
   4 #include <string.h>
   5
   6 #include "../util.h"
   7
   8 #if defined(__linux__)
   9         const char *
  10         cpu_freq(void)
  11         {
  12                 uintmax_t freq;
  13
  14                 /* in kHz */
  15                 if (pscanf("/sys/devices/system/cpu/cpu0/cpufreq/"
  16                            "scaling_cur_freq", "%ju", &freq) != 1) {
  17                         return NULL;
  18                 }
  19
  20                 return fmt_human(freq * 1000, 1000);
  21         }
  22
  23         const char *
  24         cpu_perc(void)
  25         {
  26                 static long double a[7];
  27                 long double b[7];
  28
  29                 memcpy(b, a, sizeof(b));
  30                 /* cpu user nice system idle iowait irq softirq */
  31                 if (pscanf("/proc/stat", "%*s %Lf %Lf %Lf %Lf %Lf %Lf %Lf",
  32                            &a[0], &a[1], &a[2], &a[3], &a[4], &a[5], &a[6])
  33                     != 7) {
  34                         return NULL;
  35                 }
  36                 if (b[0] == 0) {
  37                         return NULL;
  38                 }
  39
  40                 return bprintf("%d", (int)(100 *
  41                                ((b[0] + b[1] + b[2] + b[5] + b[6]) -
  42                                 (a[0] + a[1] + a[2] + a[5] + a[6])) /
  43                                ((b[0] + b[1] + b[2] + b[3] + b[4] + b[5] +
  44                                  b[6]) -
  45                                 (a[0] + a[1] + a[2] + a[3] + a[4] + a[5] +
  46                                  a[6]))));
  47         }
  48 #elif defined(__OpenBSD__)
  49         #include <sys/param.h>
  50         #include <sys/sched.h>
  51         #include <sys/sysctl.h>
  52
  53         const char *
  54         cpu_freq(void)
  55         {
  56                 int mib[2];
  57                 uintmax_t freq;
  58                 size_t size;
  59
  60                 mib[0] = CTL_HW;
  61                 mib[1] = HW_CPUSPEED;
  62
  63                 size = sizeof(freq);
  64
  65                 /* in MHz */
  66                 if (sysctl(mib, 2, &freq, &size, NULL, 0) < 0) {
  67                         warn("sysctl 'HW_CPUSPEED':");
  68                         return NULL;
  69                 }
  70
  71                 return fmt_human(freq * 1E6, 1000);
  72         }
  73
  74         const char *
  75         cpu_perc(void)
  76         {
  77                 int mib[2];
  78                 static uintmax_t a[CPUSTATES];
  79                 uintmax_t b[CPUSTATES];
  80                 size_t size;
  81
  82                 mib[0] = CTL_KERN;
  83                 mib[1] = KERN_CPTIME;
  84
  85                 size = sizeof(a);
  86
  87                 memcpy(b, a, sizeof(b));
  88                 if (sysctl(mib, 2, &a, &size, NULL, 0) < 0) {
  89                         warn("sysctl 'KERN_CPTIME':");
  90                         return NULL;
  91                 }
  92                 if (b[0] == 0) {
  93                         return NULL;
  94                 }
  95
  96                 return bprintf("%d", 100 *
  97                                ((a[CP_USER] + a[CP_NICE] + a[CP_SYS] +
  98                                  a[CP_INTR]) -
  99                                 (b[CP_USER] + b[CP_NICE] + b[CP_SYS] +
 100                                  b[CP_INTR])) /
 101                                ((a[CP_USER] + a[CP_NICE] + a[CP_SYS] +
 102                                  a[CP_INTR] + a[CP_IDLE]) -
 103                                 (b[CP_USER] + b[CP_NICE] + b[CP_SYS] +
 104                                  b[CP_INTR] + b[CP_IDLE])));
 105         }
 106 #endif